GSP
Quick Navigator

Search Site

Unix VPS
A - Starter
B - Basic
C - Preferred
D - Commercial
MPS - Dedicated
Previous VPSs
* Sign Up! *

Support
Contact Us
Online Help
Handbooks
Domain Status
Man Pages

FAQ
Virtual Servers
Pricing
Billing
Technical

Network
Facilities
Connectivity
Topology Map

Miscellaneous
Server Agreement
Year 2038
Credits
 

USA Flag

 

 

Man Pages


Manual Reference Pages  -  LIBOWFAT_IO_CANWRITE (3)

NAME

io_canwrite - return a file descriptor that can be written to

CONTENTS

Syntax
Description

SYNTAX

#include <io.h>

int64 io_canwrite();

DESCRIPTION

io_canwrite returns the next file descriptor that can be written to. You have to have used io_wantwrite() on the file descriptor earlier, and you have to have called io_wait() or io_waituntil().

These functions then keep an internal data structure on which descriptors were reported writable by the operating system.

Please note that there is no guarantee that you can still write data without blocking to that descriptor, just that you could when io_wait() or io_waituntil() were called. Another process could have written something before you. Look at the result from io_trywrite().

If there are no more descriptors that you can write to without blocking, io_canwrite will return -1. In this case you should call io_wait() or io_waituntil() again.

You should only use io_trywrite(3), io_sendfile(3) or iob_send(3) to write to the file, not plain write(2). If you use write(2) and get EAGAIN, call io_eagain(3).

SEE ALSO

io_wait(3), io_canwrite(3)
Search for    or go to Top of page |  Section 3 |  Main Index


IO_CANWRITE (3) -->

Powered by GSP Visit the GSP FreeBSD Man Page Interface.
Output converted with manServer 1.07.